Quote Originally Posted by WorzelG View Post
Even if they didn’t play what was on the film, surely some demoing of individual parts must have gone on before it was sent to the orchestra (or however they do it!) just to compose it.
Orchestral scores are traditionally started as what is called a "sketch". You can also perform these sketches with a piano (or two), which is known as a reduction. I'd wager that there are at least piano reductions out there (not counting on them seeing the light of day).